Ive heared it is better, not a whole lot though. it has better coating to reduce some lens flare and has a little less chromatic aborrations on the extreme outer edges.
it also costs 50% more for the older version which is what is listed on that site, the newer one has the motor in body which i dont really need, and that one is nearly $700. the non-motorized one is nearly impossible to find in stock.
That one would be nice, but hey, 12-24 is great, 12mm is pretty damn wide as it is, plus the ability to reach to 24 gives it more flexability.
oh yah, and i already ordered the 12-24 on friday.
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